Basic facts: Display Type Dot: Matrix Number of Display Digits: 16 Power Source: Battery Battery Type: LR44 x1 Automatic Power Down: yes Keys: Plastic Protective Case: yes Mathematical functions: Built-In Functions: 420 Entry System: Algebraic (D.A.L.) 1/x, x², square root, %: yes Pi Key: yes GCD, LCM: yes Quotient and Remainder Calculation: yes Fractions: yes